I don’t see the ecg app installed on my watch
How do I install each app on my watch
Apple Watch Sport
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The ECG app is only available on Apple Watch Series 4, Series 5, or Series 6. And is currently available only in certain countries and regions. Learn where the ECG app is available. For more info, see:
Taking an ECG with the ECG app on Apple Watch Series 4, Series 5, or Series 6 - Apple Support